Units

Units are case-sensitive. Generally only units with useful conversions
are defined. Unit tracking or aggregation is generally not desired. If
no unit is defined, the default is assumed. The following is a list of
standard units.

Length

Default is meter. Permissible units are:

m

mil, mils

in, inch

ft, foot, feet

mi, mile

Angle

Default is degrees. Permissible units are:

deg, degree, degrees

rad, radian, radians

Time

Default is seconds. Permissible units are:

day, dy, days

hour, hours, hr, hrs

min, minutes, minute

s, second, seconds

Percent

Permissible units are:

%

Log

Metric

Default is no modifier. If the unit is not one of the
above, then the first character in the unit will set the multiplier.
Therefore 'nF', 'nH', 'n', and 'no_unit' are all equivalent to Mason
(obviously the last one would cause confusing results for the unwary
designer).